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Posts Tagged ‘Project Log’

Holiday break project

Tuesday, December 24th, 2013

Sqkybeaver writes, "who's been working on projects this holiday? I just hit a relatively high point in one of my projects. just barely up to spec for 2M transmitter." Via the project log forum.

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Digitally controlled power supply

Wednesday, January 16th, 2013

Wvdv2002 shared his digitally controlled power supply with us in the forums. It's capable of driving 0-18V while having a current controlled output of 0-3A. The brains of the design is the PIC18f46j50 which controls a switch mode regulator's voltage and current output through the MCP4822 two channel I2C DAC....

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Posted in project logs | 3 Comments »

4 Channel electronic load

Wednesday, December 26th, 2012

Need to test your power supply with a 20A capable electronic load? Gelbanana is designing just such a device. It's an electronic load designed to spread the heat dissipation through 4 transistors each taking 5 Amps. So far he is testing the cooling system which consists of two massive aluminum...

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Sensorless Brushless DC Motor Drive with MSP430

Wednesday, December 19th, 2012

A booster board for the MSP430 LaunchPad controls brushless DC motors with or without sensors. A bunch of double NPN transistor MBT2222AD ICs drive the motors: I thought that I would share my project on the forum. I call it BLDC Booster. It is a booster pack for the MSP430...

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Posted in MSP430, project logs | 4 Comments »

Loggrid – Power line frequency and voltage monitor/logger

Friday, November 9th, 2012

Matseng is currently developing a power line frequency, and voltage monitor. The design is meant to monitor the quality of the line power and log to an SD card for later computer analysis. He is sharing his development through GitHub and discussing it in the forum. I'm thinking of doing...

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CNC stepper controller

Tuesday, October 23rd, 2012

Bearmos designed a 3-axies CNC stepper motor controller. It has a ATX connector, allowing it to be powered from a computer power supply. The motors are driven via onboad driver chips, while commands are received from the computer Via the parallel port. This board is mainly designed to be inexpensive,...

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Posted in project logs | 4 Comments »

Watch out for those pesky erratas

Thursday, October 18th, 2012

Got burned by the errata? Yup, we have a bunch of times. This also happened to Matseng on his 6502 Single Board Computer Emulator. The datasheet (Atmel XMEGA D4) plainly said that the Port E can be used as a secondary I2C port, so with that assumption in mind he...

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Posted in project logs | 11 Comments »

Little Wire dead bug art

Monday, October 8th, 2012

Matseng was bored over the weekend and decided to make some art. He soldered up a Little Wire in dead bug style using a fine tipped soldering iron, stereo microscope, and 2 hours of his time. Check out below how this project ended up when encased in not so clear...

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Posted in project logs | 22 Comments »

LOpen logic probe detects high, low, and floating pins

Wednesday, October 3rd, 2012

LOpen is a PIC-based logic probe that fits inside a pen. It detects if a pin is at a logic 'High', logic "Low", or at high impedance (floating). This time it's a Logic Pen controlled by a tiny 6-pin PIC10F202. The PCB is 5 cm by 5mm so it fits...

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DIY Audio function generator

Friday, May 4th, 2012

DIY Audio function generator  is a low-distortion function generator which operates in the Audio frequency range. Conventional function generators use a square wave signal to generate the other waveforms like triangle, or sine wave. This approach adds noise to the sine wave output, which is the one waveform Eric wants...

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Open source soldering iron driver update

Wednesday, November 23rd, 2011

Arhi has been busy debugging noise from PTC type soldering iron sensors. The problem was the sensor's sensitivity to the current used as a bias. If the current used is greater or less then 1mA the sensor picks up too much noise. In the latest revision of the Soldering iron...

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Recent Comments

  • Geert Jordaens: I'm not sure what kind of licensing I have to add since it is a fairly straight forward implementation of the adaptive Huffman Decoding. For...
  • erich: For anyone interested, I've added some c++ code for adaptive huffman decoding in the git repository.
  • Sjaak: I would add some more protection in the used trigger file (on the serverpilot site) then not using a standard name :) hopefully they use...
  • Pete Castagna: My friend Charlie who worked in synthesizers at a DOD type of place made a modification to this avalanche pulse generator that allowed him to...
  • Sam Catchpole: Yes please :D